Theorem scutfo 27957

Description: The surreal cut function is onto. (Contributed by Scott Fenton, 23-Aug-2024.)

Assertion

Ref	Expression
scutfo	⊢ |s : <<s –onto→ No

Proof of Theorem scutfo

Dummy variables 𝑥 𝑦 are mutually distinct and distinct from all other variables.

Step	Hyp	Ref	Expression
1		scutf 27872	. 2 ⊢ |s : <<s ⟶ No
2		lltropt 27926	. . . . 5 ⊢ ( L ‘𝑥) <<s ( R ‘𝑥)
3		df-br 5149	. . . . 5 ⊢ (( L ‘𝑥) <<s ( R ‘𝑥) ↔ ⟨( L ‘𝑥), ( R ‘𝑥)⟩ ∈ <<s )
4	2, 3	mpbi 230	. . . 4 ⊢ ⟨( L ‘𝑥), ( R ‘𝑥)⟩ ∈ <<s
5		lrcut 27956	. . . . 5 ⊢ (𝑥 ∈ No → (( L ‘𝑥) |s ( R ‘𝑥)) = 𝑥)
6	5	eqcomd 2741	. . . 4 ⊢ (𝑥 ∈ No → 𝑥 = (( L ‘𝑥) |s ( R ‘𝑥)))
7		fveq2 6907	. . . . . 6 ⊢ (𝑦 = ⟨( L ‘𝑥), ( R ‘𝑥)⟩ → ( |s ‘𝑦) = ( |s ‘⟨( L ‘𝑥), ( R ‘𝑥)⟩))
8		df-ov 7434	. . . . . 6 ⊢ (( L ‘𝑥) |s ( R ‘𝑥)) = ( |s ‘⟨( L ‘𝑥), ( R ‘𝑥)⟩)
9	7, 8	eqtr4di 2793	. . . . 5 ⊢ (𝑦 = ⟨( L ‘𝑥), ( R ‘𝑥)⟩ → ( |s ‘𝑦) = (( L ‘𝑥) |s ( R ‘𝑥)))
10	9	rspceeqv 3645	. . . 4 ⊢ ((⟨( L ‘𝑥), ( R ‘𝑥)⟩ ∈ <<s ∧ 𝑥 = (( L ‘𝑥) |s ( R ‘𝑥))) → ∃𝑦 ∈ <<s 𝑥 = ( |s ‘𝑦))
11	4, 6, 10	sylancr 587	. . 3 ⊢ (𝑥 ∈ No → ∃𝑦 ∈ <<s 𝑥 = ( |s ‘𝑦))
12	11	rgen 3061	. 2 ⊢ ∀𝑥 ∈ No ∃𝑦 ∈ <<s 𝑥 = ( |s ‘𝑦)
13		dffo3 7122	. 2 ⊢ ( |s : <<s –onto→ No ↔ ( |s : <<s ⟶ No ∧ ∀𝑥 ∈ No ∃𝑦 ∈ <<s 𝑥 = ( |s ‘𝑦)))
14	1, 12, 13	mpbir2an 711	1 ⊢ |s : <<s –onto→ No

Syntax hints:   = wceq 1537   ∈ wcel 2106  ∀wral 3059  ∃wrex 3068  ⟨cop 4637   class class class wbr 5148  ⟶wf 6559  –onto→wfo 6561  ‘cfv 6563  (class class class)co 7431   No csur 27699   <<s csslt 27840   |s cscut 27842   L cleft 27899   R cright 27900

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1792  ax-4 1806  ax-5 1908  ax-6 1965  ax-7 2005  ax-8 2108  ax-9 2116  ax-10 2139  ax-11 2155  ax-12 2175  ax-ext 2706  ax-rep 5285  ax-sep 5302  ax-nul 5312  ax-pow 5371  ax-pr 5438  ax-un 7754

This theorem depends on definitions:  df-bi 207  df-an 396  df-or 848  df-3or 1087  df-3an 1088  df-tru 1540  df-fal 1550  df-ex 1777  df-nf 1781  df-sb 2063  df-mo 2538  df-eu 2567  df-clab 2713  df-cleq 2727  df-clel 2814  df-nfc 2890  df-ne 2939  df-ral 3060  df-rex 3069  df-rmo 3378  df-reu 3379  df-rab 3434  df-v 3480  df-sbc 3792  df-csb 3909  df-dif 3966  df-un 3968  df-in 3970  df-ss 3980  df-pss 3983  df-nul 4340  df-if 4532  df-pw 4607  df-sn 4632  df-pr 4634  df-tp 4636  df-op 4638  df-uni 4913  df-int 4952  df-iun 4998  df-br 5149  df-opab 5211  df-mpt 5232  df-tr 5266  df-id 5583  df-eprel 5589  df-po 5597  df-so 5598  df-fr 5641  df-we 5643  df-xp 5695  df-rel 5696  df-cnv 5697  df-co 5698  df-dm 5699  df-rn 5700  df-res 5701  df-ima 5702  df-pred 6323  df-ord 6389  df-on 6390  df-suc 6392  df-iota 6516  df-fun 6565  df-fn 6566  df-f 6567  df-f1 6568  df-fo 6569  df-f1o 6570  df-fv 6571  df-riota 7388  df-ov 7434  df-oprab 7435  df-mpo 7436  df-2nd 8014  df-frecs 8305  df-wrecs 8336  df-recs 8410  df-1o 8505  df-2o 8506  df-no 27702  df-slt 27703  df-bday 27704  df-sslt 27841  df-scut 27843  df-made 27901  df-old 27902  df-left 27904  df-right 27905

This theorem is referenced by: (None)